IR radiation, black body radiation and the Greenhouse Effect
- Created by: mimidollins
- Created on: 14-05-20 09:55
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- Infra-Red Radiation, Black Body Radiation & The
Greenhouse Effect
- The Greenhouse Effect
- temp of earth depends on rate IR is absorbed and emitted.
- ground absorbs short wavelength visible light
- easily passes through atmosphere and warms ground
- E cools down by emitting IR radiation
- harder for IR to pass through atmosphere because CO2 absorbs IR
- Not all IR escapes=E heats up
- Global warming= lots of CO2= more IR absorbed= E heats up more
- harder for IR to pass through atmosphere because CO2 absorbs IR
- E cools down by emitting IR radiation
- easily passes through atmosphere and warms ground
- Black body radiation.
- absorbs all EM radiation falling on it
- perfect emitter of radiation
- At fixed temp, emits across a continuous range of wavelengths but peaks at a particular wavelength
- as temp increases, peak gets higher and peak wavelength gets shorter.
- calculate temp by measuring peak wavelength
- as temp increases, peak gets higher and peak wavelength gets shorter.
- The Greenhouse Effect
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